The LCS are still used but they building fewer of them and are starting a new frigate program. The navy is probably going to build a licensed version of a ship already developed by an ally. I read an article a few weeks back listing a French, Italian and British design as contenders to get them in the water faster.
wiki: If the Italian FREMM design is selected, the Marinette Marine shipyard in Wisconsin, part of the Fincantieri group, would build the guided-missile frigates. Marinette Marine is best known for the US Navy Freedom-class littoral combat ship.
On 16 February 2018 Fincantieri Marine was one of 5 companies who were each awarded a $15 million contract for conceptual design of the frigates, which the Navy will evaluate over 16 months ahead of a final request for proposal in 2019 and a contract award in 2020
would look like this Italian design for Australia
Big draw back is its slow 30 kt speed.